Looze vennootschap de bataafsche petroleum maatschappij



Sept 29, 1931- A. G. H. STRAATMAN 1,825,213

MEANS FOR RECORDING THE INCLINATION AND VTHE ANGULR POSITION OF CORES IN BORE HOLES Filed July 25, 1929 2 Sheets-Sheet l A. MEANS FOR RECORDING THE INCLINATION AND THE Sept. 29, 1931. G. H. STRAATMAN 1,825,213

ANGULAR POSITION OF CORES IN BORE HOLES Filed July 25 1929 2 Sheets-Sheet 2 Patented Sept. 29, 1931 .UNITED STATES PATENT- OFFICE ALPHONS G. H. STRAATMAN, OF THE HAGUE, NETHERLANDS, ASSIGNOR T0 NAAM- LOOZE VENNOOTSCHAP DE BATAAFSCHE PE'raoLEUnr MAATSCHAPPIJ, or Aman HAGUE, NETHERLANDS, A COMPANY OF THE NETHERLANDS MEANS FOR RECORDING THE INCLINATION THE ANGULAB POSITION OF COREE m i IBORE HOLES VApplication med Iuly 25, 1929, Serial No. 380,807, and in the Netherlands August 3, 1928.

This invention relates to the art pf eX- ploratory drilling, an'd has in view to pro- .vide an improved device by means of which the direction of the dip or inclination of a strata of material encountered in core drilling` may be determined positively, and with facility.

In the drawings, wherein is4 illustrated a practical embodiment of the invention:

Fig. 1 is a vertical section through the upper portion of a device constructed in accordance with the invention; and Fig. 2 is a similar view through the lower portion of the device. 152 The hole drilled in the rock is lined by the usual casing 2 enclosing an auxiliary casing 3, which rests with its lower edge on the bottom of the bore hole and which is kept by guiding arms 4 in concentric relation with casing 2; The grit 5 has been washed away from casing 3 and has accumulated in the annular space between the lower portions of both casings. The central hole 6 has been drilled by a tool for rat tailing kept in con- Il centric relation with casing` 3, care having been taken during the washing to also remove the grit from said hole.'

Suspended from a cable, not shown on the dra-wings, is a housing for a surveying in- 80 strument for recording the angle of the hole from the vertical, and for a saw connected therewith so as to be prevented from turning in azimuth relative thereto. If this system is lowered a little, from the position shown, the saw cuts a notch in the cylindrical wall of' hole 6. After a suitable lapse of time, a clockwork completes the electric circuit of the electrolyzer, whereby the position of the air' bubble in the liquid level is recorded.

The surveying instrument comprises the following parts, the functioning of which will be readily understood by any one skilled in the art:

A steel housing 7 having guiding fins 8; a bottom cover 9 having av threaded hole by means of which it can be removed from the housing; a brass sleeve'11 enclosing various parts of the electrolyzer; a clockwork shown 50 symbolically as at 12 and adapted to rotate cal, concave bottom face and secured by a` a contact disk 13; a contact pin 14 loaded by a current carrying spring 15 enclosed by an insulating sleeve; a battery 16; a diskshaped metallic cathode 18 having a sphericontact screw 17 to the surrounding insulati ing material; an insulating container 19 :for the electrolyte, having a small recess 20 and passages 21 in its bottom; a cup-shaped metallic anode 22 having its bottom provided with a nozzle 23, an insulating save-all 24 and a rubber gasket 25; a pin 27 for preventing rotation of sleeve 11 relative to the insulating holder 26 of battery 16;-a pin 28 for preventing rotation of the holder 26 relac5 tive to the cathode 18; pins 29 preventing rotation of the bottom cover 9 relative to the brass sleeve 11; a ,pin 30 preventing rotation of the bottom cover 9 relative to the saw holder 31; a pin 32 preventing rotation of the saw vholder 31 relative to the steel housing 7.

The clockwork 12 is arranged to periodically complete and break a circuit between the contact disk 13 and the metal mass of the surveying instrument. The contact device proper has not been illustrated in further detail, because its exact construction is imma terial as far as this invention is concerned. When the circuit is completed, current flows from battery 16 to contact pin 14, contact disk 13, metal mass, anode 22, electrolyte, cathode 18 and contact screw 17 back to battery.

It is pertinent here to remark that, when the container 19 and the cup-shaped anode 22 are to be filled, the system vcomprising the parts 26, 17, 19, 22, 23 is introduced with its nozzle 23 into the neck of a rubber bulb or bottle filled with the electrolyte. If then the nozzle is turned to point in upward direction and the bulb is alternately compressed and released, the electrolyte will flow from the bulb into the container 19, whereas the air from the container will flow into the bulb. During the filling of the container 19, some. air will remain trapped in the recess 20, and when the container is thereafter returned into the position shown, this air will form a small bubble on the concave bottom face 100 of the cathode 18. Any excess of air that might remain within the container 19 accumulates in the annular space intermediate between the parts 19 and 22.

5 The upper portion of the steel holder 7 is provided with internal screw thread 33 for receiving a weight, not shown, suspended from a cable. The saw holder 31 is adapted to receive the tail 34' of a saw blade 35. A

tapering pin 36 prevents rotation of the tail 34 relative to the holder 31.

In the use of the device, it is understood, of course, that the rotated position of the device in the drill hole and therefore the direction of the mark made by the saw 35 is known.

It will also be understood that when the'electric circuit is completedthrough the electrolyte, a deposit will form over all of the surface of the cathode that is 'exposed to the 2u electrolyte, except the small area of said surface that isexposed to the gas bubble.\ Thus, a mark will be produced on the cathode surface, and as the cathode is held against rotation relative to the saw 35, it follows that if the `core is marked by the saw and subsequently removed from the drill hole, the same may readily be oriented by means of the present device and a suitable direction and in clination indicating instrument, such as a'gyroscopic compass, employed in connection therewith. And with orientation ofthe core, it is apparent that the direction of the dip or inclination of the strata from which the core A is removed may readily be determined by an inspection of the core.

What I claim is In a. device for 'recording the inclination" of a bore hole and the angular position of a core in said hole including marking means 40 for indicating the rotated position of the device relative to the core; a liquid level. comprising aV container having a concave top surface constituting a cathode, means to prevent rotationiof said cathode relative to said marking means. said container being adapted to be substantially filled with an electrolyte to provide a gas bubble between the electrolyte and said cathode surface. and means for passing an electric current through said electrolyte and, said cathode to eii'ect a deposit on all of the cathode surface except that portion of said surface which is exposed to said gas bubble. i vIn testimony whereof. I aix my signature. ALPHNS G. AII. STRAATMAN. 

